I have LLM ext cab and one rear door does not close securely unless it's slammed shut. There are adjusting screws on the hinge but I don't know what they adjust. Has any one encountered this problem?

Adjusting screws on a hinge will usually only control the tension that holds the door open, but I haven't looked at the hinges on the new body style. Is the door aligned properly? I.e., are the strikers lined up appropriately with the latches?

I don't know if they're the same, but on my EC there are two bolts you can loosen on the lower door striker bracket and that enables you to move it around a little. If your door isn't closing, it'd seem like tapping the bracket away from the truck a bit would do the trick.